题目

 My sister was very unhappy for _______ to the party.A. having not been invited  B. not having invited  C. having not invited  D. not having been invited 答案：D印度经常发生水旱灾害的主要原因是A．水土流失严重B．西南季风的影响C．地形遭到破坏D．原始森林遭到破坏